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Old 2nd October 2008, 10:56 AM   #1
AKSA is offline AKSA  Australia
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Default Operating point for 6GK5

Looking at this tube, it's mu is 78, rp is 5400R. It would be a great candidate for a preamp using a trafo, say with 12:1 step down, giving overall gain around 6, 15.5dB. This should give a Zout around 40R, which would give it terrific drive. The only downside would be overload margin, probably not much better than 3Vpp.

Has anyone used this tube, could I ask your experience of the best operating voltages and currents for nicest sound?

Cheers,

Hugh
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Old 3rd October 2008, 12:00 PM   #2
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bump??
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Old 3rd October 2008, 02:46 PM   #3
jazzbo is offline jazzbo  Canada
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Try to get in touch with Eric Kingsbury aka Poinz of AudioTropic. He uses the 6GK5 in his amp designs in a diff pair/driver. I have tried it driving an IT and was less than impressed but I didn't play around with operating points.
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Old 4th October 2008, 09:08 AM   #4
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Thanks Jazzbo,

Will speak to Eric.

Any others want to offer comment?
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Old 4th October 2008, 12:27 PM   #5
Tweeker is offline Tweeker  United States
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The 6GK5 is a frame grid, gain controlled triode designed for use as a VHF RF amplifier.
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Old 4th October 2008, 01:56 PM   #6
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Gary Pimm uses them in his phono stage. 2,5mA or current running through it.

http://www.pacifier.com/~gpimm/phono.htm
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Old 6th October 2008, 04:21 PM   #7
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Hugh,
I just put together a little SET amp using the 6GK5 to drive a 1626.
The 6GK5 is battery biased (Nimh) at about 1.3vg/6ma and the 1626 @ 23v/23ma.
I needed the gain up front because my signal source is only 200mv (old computer CD drive line out)
So far I'm liking it a lot.
robert
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